Properties of the Number -21093

Twenty-One Thousand Ninety-Three

Basics

Value: -21094 → -21093 → -21092

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 79 × 89

Divisors: 1, 3, 79, 89, 237, 267, 7031, 21093

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101001001100101

Octal: -51145

Duodecimal: -10259

Hexadecimal: -5265

Square: 444914649

Square Root: 145.23429347092923

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

a(n) = a(n-2) - 2a(n-3) + a(n-4) for n>3, with a(0)=2, a(1)=0, a(2)=1, a(3)=-1, a sequence related to Pellian numbers. A292521

T(n,k) is the number of -k..k arrays of n elements with first, second and third differences also in -k..k. A202124

Expansion of ∏_k>=1 (1 + x^k)^binomial(k+3,3). A343200

Expansion of (1+x²)*(1+x⁵)*(1+x⁸)/((1-x)*(1-x²)*(1-x³)*(1-x⁴)*(1-x⁵)*(1-x⁶)*(1-x⁷)*(1-x⁸)*(1-x⁹)*(1-x¹⁰)). A69950

Triangle of coefficients of polynomials u(n,x) jointly generated with A209169; see the Formula section. A209168

Lower midsequence of the Fibonacci numbers (1,2,3,5,8,...) and Lucas numbers (1,3,4,7,11,...); see Comments. A355324

Low-temperature susceptibility expansion for square lattice (Potts model, q=4). A57379

Numbers k such that σ(k+1) - σ(k) = σ(k)/d(k), where d(k) denotes the number of divisors of k. A66176

a(n) = A108466(A025487). A108467

Number of -4..4 arrays of n elements with first, second and third differences also in -4..4. A202120